Filter lbaasv2 ports with device_name="network:f5lbaasv2"
Filter lbaasv2 ports with device_name="network:f5lbaasv2"

[#146234381](https://www.pivotaltracker.com/story/show/146234381)

Signed-off-by: Mario Manno <8864a2bb5a18000088ba480e1b96429e650956d4@gmail.com>

cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release,cloudfoundry-incubator/bosh-openstack-cpi-release